Combined electromagnetic regulator and switch



July 18, 1944. F. MENZEL 2,354,038

COMBINED ELECTROMAGNETIC REGULATOR AND SWITCH Filed March 10, 1942 In yen/0r fl/zw m'cz, Men

T( HI! Allorney Patented July 18, 1944 COMBINED ELECTROMAGNETIC REGU- LATORAND SWITCH Friedrich Menzel, Stuttgart, Germany; vested in theAlien Property Custodian Application March 10, 1942, Serial No. 434,042 In Germany May 6, 1940 5 Claims.

The invention relates to combined electromagnetic regulator and switches for controlling electric circuits, and more particularly adapted for use in connection with battery-charging generators especially on vehicles.

In order to obtain a good utilization of the magnet core for three armatures a transverse piece is arranged, according to the invention, on the magnet core so that the one part of the magnet core influences one of the armatures, the other part of the magnet core the second armature and the whole magnet core the third armature. The advantage is hereby attained to obtain three different paths of the magneticflux of which one can be used for a voltage'regulator, the second for a current regulator or for a" control.

Fig. 3 is a detail view showing a modification of the circuit arrangement shown in Fig. 2.

The regulator switch arrangement shown in Fig. 1 comprises a magnet core I with a pressure coil 2 and a current coil 3, between which a transverse piece 4 is mounted on themagnet core I.

The magnet core I is arranged ona base plate 5 of a magnet frame 5, 6, I, on the upwardly ex-' tending arm 6 of which an armature 81 is sus pended. The transverse piece 4 is equipped with an upwardly extending arm 9 on the end of which an insulated armature I0 suspended. On the arm 9 of the transverse piece 4 an armature I I is suspended insulated. The two armatures Ill and II are connected by a wiring I2.

The armature 8 belongs to its automatic charging switch and carries a contact spring I3, the contact I4 of said spring co-operating with a contact I5. The contact I5 is connected to a battery- I6. regulator and carries a contact spring I1, the contact I8 of which co-operates with a contact 29 which is grounded. The armature II belongs to a current regulator and carries a contact 28, which co-operates with a contact 2!.

leads to the contact 2|.

The line of force flux of the charging switch extends through the whole magnet core. I, the

The armature I0 belongs to. a voltage" A dynamo 22 has a field winding 23 and a field resistance 24; between which the wire 25 is connected which right handhalf of the base plate 5, the arm I5 and the armature 8. The line'of force flux of the voltage regulator extends through the upper part of the magnet core I, the transverse piece 4, the arm 9 and the armature Ill. The line of force flux of the current regulator extends through the lower part of the magnet core I, the left hand half of the base plate 5, the extension piece I of the magnet frame and the armature I I. The line of force fluxes of the voltage regulator and of the current regulator use both the transverse piece 4 without impairing thereby the operation of the two regu-' lators.

In the switched position shown in the drawing the field resistance 24 is short-circuited by the following connection: wire 25', pair of contactsZ I, 20,,armature I I, wire I2, armature IIJ, pair of contacts I8, I9, ground. When the dyamo 22 produces suiiicient voltage, the armature 8 is attracted and closes the pair of contacts I4, I5, whereby the following circuit is closed: ground, dynamo 22, current coil 3, magnet frame 5, 6, armature 8, contact spring I3, pair of contacts, I4, l5, battery I6, ground. The battery I6 is charged from the dynamo 22. If at low number of revolutions of the dynamo 22 a return current flows from the battery IB to the dynamo 22, the charging switch opens its pair of contacts I4, I5 under-the influence of the return current flowing through the current coil 3.

If after the closing of the charging switch, the voltage produced by the dynamo 22 rises to beyond a certain amount, the armature i0 is attracted. under the influence of the voltage coil 2 and opens the pair of contacts I8, I9. The resistance 24 becomes thereby eiiecti-ve in the circuit of the field winding 23. The voltage regulator begins to regulate to uniform voltage by periodical switching-in and cutting-out of the field resistance 24.

At a predetermined current intensity the armature II is attracted under the influence of the current coil 3 and opens the pair of contacts 20,

2I. Thereby the resistance 24 in the circuit of the field winding 23 becomes also effective. current regulator regulates by periodical. switching-in and cutting-out of the field resistance 24 to rapidly decreasing voltage of the dynamo 22,

so that an overloading of the dynamo 22 by high The other arm is opposite to the atracting surface of the magnet frame formed by the extension piece I. The construction of the magnet frame 5, 6, I

and the arrangement of the three armatures 8, I and II enable a compact construction of the.

two regulators and of the charging switch. On the magnet core I only two coils 2 and 3 are arranged which influence the voltage regulator, the current regulator and the charging switch in a practical manner.

The regulator switching arrangement shown in Fig. 2 is essentially of the same construction as the arrangement shown in Fig. l and differs chiefly by the arrangement of another coil on the magnet core and by a different manner of operation of the two regulators.

On the part of the magnet core I co-ordinated to the voltage regulator and situated above the transverse piece 4 there is arranged, besides the voltage coil 2, a current coil 25. The armature I I, which in this instance is not suspended insulated comprises a contact 2'! which cooperates with a contact 23, to which one of the ends of the current coil 26 is connected. The armature !I controls the current coil and forms consequently a control regulator. The armature I of the voltage regulator, suspended insulated, is connected to a wire 29 branching off between the field winding 23 and the field resistance 24. The contact I8 on the armature I U of the voltage regulator can oscillate between the contact I9 and a contact 39 mounted on the arm 9 of the transverse piece 4. The purpose of the contact is to short circuit the field winding of the generator.

The armature I 0 of the voltage regulator regulates the voltage of the dynamo by periodical switching-in and short-circuiting of the field resistance 24 or by periodical short-circuiting and switching-in of the field winding 23. Up to a certain current intensity it is regulated to uniform. voltage. When this certain current is exceeded, the armature II of the control regulator is attracted under the influence of the current coil 3 and closes the pair of contacts 21, 28, whereby the current coil 26 is switched parallel to the current coil 3. The voltage regulator is then influenced as well by the voltage coil 2 as also by the current coil 26 and consequently regulates then the dynamo 22 to decreasing voltage. The dynamo 22 is thus protected against stressing by too high current delivery. At high currents the voltage of the dynamo 22 does not drop so rapidly owing to this regulation as it is the case in the arrangement shown in Fig. 1, so that the dynamo is better utilized.

Instead of the current coil 26 a voltage coil may be provided on the upper part of the magnet core, this voltage coil being arranged parallel to the voltage coil 2 and the circuit of the same is switched-in and cut-out by the contacts 21, 28 of the control regulator. Thus in Fig. 3 the armature I I may be insulated from the magnet frame and connected to ground at 39 and when operated will connect voltage coil 25' to ground.

I claim:

1. The combination of a variable speed generator and a storage battery to be charged thereby, said generator having a shunt field and a. regulating resistance connected thereto, of an electromagnetic structure comprising a core, a cross piece of magnetic material intermediate the ends of said core, a voltage coil on said core at one side of said piece and connected across said generator, a normally open circuited series coil wound on said core at the said one side of said cross piece, a second series coil wound on said core at the opposite side of said cross piece, a magnetic frame secured to one end of said core and extending substantially the length thereof, an armature supported on said frame and movable in response to the total flux through said core to close the circuit from said generator to said battery, said cross piece having an extension along said core on said one side, an armature carried by said extension, normally short circuiting said resistance and operable by the flux in the core at said one side to connect said resistance in circuit in series with said field, and an armature operable in response to the flux in said core at said opposite side to close the circuit through said normally open circuited series coil on said one side in parallel to the circuit through said series coil on said opposite side, said coils being wound and connected in such a way that their respective currents create fluxes which are additive when said battery is-charging.

2. The combination of a variable speed generator and a storage battery to be charged thereby, said generator having a shunt field and a regulating resistance connected thereto, of an electromagnetic structure comprising a core, a cross piece of magnetic material intermediate the ends of said core, a voltage coil on said core at one side of said piece and connected across said generator, a normally open circuited coil wound on said core at the said one side of said cross piece, a series coil wound on said core at the opposite side of said cross piece, a magnetic frame secured to one end of said core and extending substantially the length thereof, an armature supported on said frame and movable in response to the total flux through said core to close the circuit from said generator to said battery, said cross piece having an extension along said core on said one side, an armature carried by said extension, normally short circuiting said resistance and operable by the flux in the core at said one side to connect said resistance in circuit in series with said field, and an armature operable in response to the fiux in said core at said opposite side to close the circuit through said normally open circuited coil on said one side, said coils being wound and connected in such a way that their respective currents create fluxes which are additive when said battery is charging.

3. The apparatus claimed in claim 1 wherein contacts and connections are provided whereby on release of the armature mounted on said cross piece the field of said generator is short circuited.

4. The apparatus claimed in claim 1 wherein the frame, the cross piece and the armatures are L-shaped, each having portions extending along said core and a portion normal to the core axis and such elements together form a substantially rectangular box like structure enclosing the coils.

5. The combination of a variable speed generator and a storage battery to be charged thereby, said generator having a shunt field and a regulating resistance connected thereto, of an electromagnetic structure comprising a core, a cross piece of magnetic material intermediate the ends of the core, a voltage coil on said core at one side resistance and operable by the flux in said core at 10 said one side to connect said resistance in series with said field, and an armature operable in response to the flux in said core at said opposite side to close the circuit through said normally open circuited coil, said coils on said one side being wound and connected in such a way that their respective currents create fluxes which are additive when the battery is charging.

FRIEDRICH MENZEL. 

